Question 1

Which of the following best describes the function of the fibrous pericardium?

Accepted Answer

It anchors the heart to surrounding structures and prevents overfilling.

Question 2

A patient presents with chest pain and is diagnosed with pericarditis. Which of the following best explains the physiological consequence of this condition?

Accepted Answer

Inflammation of the pericardium increases friction, potentially restricting heart movement.

Question 3

Which sequence correctly traces the pathway of blood through the heart and lungs, starting from the right atrium?

Accepted Answer

Right atrium → Right ventricle → Pulmonary artery → Lungs → Pulmonary vein → Left atrium → Left ventricle → Aorta

Question 4

Which of the following best explains why the left ventricle has a thicker myocardium than the right ventricle?

Accepted Answer

It must generate higher pressure to pump blood through the systemic circuit.

Question 5

A patient with mitral valve prolapse is most likely to experience which of the following complications?

Accepted Answer

Regurgitation of blood from the left ventricle into the left atrium during ventricular contraction.

Question 6

Which of the following best describes the role of intercalated discs in cardiac muscle?

Accepted Answer

They allow rapid transmission of action potentials and mechanical coupling between cells.

Question 7

Which of the following is a key difference between cardiac and skeletal muscle tissue?

Accepted Answer

Cardiac muscle cells are connected by intercalated discs, while skeletal muscle cells are not.

Question 8

Which of the following best describes the function of the chordae tendineae?

Accepted Answer

They prevent the atrioventricular valves from inverting into the atria during ventricular contraction.

Question 9

A patient is found to have a blockage in the left coronary artery. Which of the following is the most likely consequence?

Accepted Answer

Reduced oxygen delivery to the left side of the heart, increasing risk of myocardial infarction.

Question 10

Which of the following best explains the significance of the absolute refractory period in cardiac muscle?

Accepted Answer

It prevents tetanic contractions, ensuring the heart can relax and refill with blood.

Question 11

Which of the following equations correctly calculates cardiac output ($$CO$$)?

Accepted Answer

$$CO = HR 	imes SV$$

Question 12

A patient has a heart rate ($$HR) of 80 $$beats per minute and a stroke volume ($$SV) of 70 mL $$per beat. What is their cardiac output ($$CO) in $$liters per minute?

Accepted Answer

$$CO = 80 	imes 70 = 5600$$\ mL/min = 5.6\ L/min

Question 13

Which of the following would most likely increase stroke volume?

Accepted Answer

Increased venous return (preload)

Question 14

Which of the following is a positive chronotropic factor?

Accepted Answer

Epinephrine

Question 15

A patient with persistent tachycardia is at increased risk for which of the following complications?

Accepted Answer

Reduced ventricular filling time, potentially leading to decreased cardiac output.

Question 16

Which of the following best describes the effect of a negative inotropic agent on the heart?

Accepted Answer

It decreases the force of cardiac muscle contraction.

Question 17

During which phase of the cardiac cycle does isovolumetric contraction occur, and what is its significance?

Accepted Answer

Early systole; all valves are closed while ventricular pressure rises.

Question 18

A patient with congestive heart failure develops pulmonary congestion. Which of the following best explains this finding?

Accepted Answer

The left ventricle fails to pump blood efficiently, causing fluid to back up into the lungs.

Question 19

Which of the following best describes the role of the sinoatrial (SA) node in cardiac physiology?

Accepted Answer

It acts as the primary pacemaker, initiating each heartbeat.

Question 20

Which of the following best explains why an ectopic focus can lead to arrhythmias?

Accepted Answer

It generates abnormal pacemaker activity, disrupting the normal cardiac rhythm.

Chapter 18: The Cardiovascular System – The Heart

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